Frank rhind



F. BEIM. ARGAND LAMP.

l 'Patented July 12', 1892.

(No Model.)-

INVENTO' R ATTORNEY.

'nos noms Pefrsns co, womxrmm, wAsmnarm. r f

JMW

Nrran STATESv vBe'rrzitrr OFFICE. l

FRANK RHIND, OF MERIDEN, CONNECTICUT, ASSIGNOR OF ONE-HALF TO THE EDWARDMILLER tr COMPANY, OF SAME PLACE.

ARGAN D LAM P.

SPECIFICATION forming part of Letters Patent No. 478,639, dated July 12,1892.

Avpllcation tiled November 29, 1890. Serial No. 373,061. (No model.)

To all whom, it may concern:

Be it known that I, FRANK RHIND, a citizen of the United States,residing at Meriden, New Haven county, Connecticut, have invented a newand useful Improvement in Argand Lamps, of which the following is aspecification.

My invention relates to Argand or centraldraft lamps, and is intended toso regulate and direct the air supplied to the llame as to improvecombustion and to prevent the burner or lamp from becoming undulyheated.

In the drawings, Figure l represents in vertical section so much of anArgand lamp asis necessary to illustrate my invention. Fig. 2 is ahorizontal section through the line at, Fig. l. Fig. 3 is a top planView of the dome or outer deflector removed from the lamp.

The same letters refer to like parts in the several views. y

A designates the body of an Argand lamp;

B, the inner and C the outer wick-tube; D, the

Wick; E, a volute partition; F, a spreaderpost; G, a spreader consistingof the disks g and g; H,an outer detlector or dome; h, perforations inthe dome H; I, a chimney-gallery; J, a foraminous burnerfskirt.

In the example of my invention illustrated in the drawings the lamp-bodyA, concentric Wick-tubes B and C, chimney-gallery I, and skirt J are ofusual or any desirable forni. Any desired means for adjusting the Wiek'Dmay be used. Vithin the inner air-supply tube of large Argand'lamps ithas been customary to insert a plurality of concentric tubes held inposition by interposed radial partitions. The function of these tubes isto break up and divide the ascending air-current and to prevent eddiesin the air-supply tube. They are objectionable as somewhat expensive andas the radial partitions tend to divide or serrate the llame. In otherconstructions corrugated coiled strips are used. These are open to thesame objections as being relatively expensive and difficult tomanufacture and as forming substantially radial partitions.

tute for this plurality of concentric tubes a volute or spirally-formedpartition E, (shown in horizontal section in Fig. 2,) the inner coil ofwhich is preferably adapted to form a In the present device I substi`socket or seat for the spreader-post F. This volute partition E may bemade either of imperforate sheet metal, as shown in Fig. l, or it may beforaminous, as indicated in Fig. 2. In either case it is found inpractice to effectually prevent eddies and cross-currents in the innerair-supply tube and to insure an even and regular delivery of air to theinner mantle of the flame.

The function of the spreader-post F is to support the spreader G, Which,as shown, consists of two concave-convex foraminous disks g and g',preferably of light sheet metal, with their concave sides toward eachother and with their edges in contact and preferably secured together.It is obvious that the foraminous disks g and g may either or both bemade of another form than the cancavoconvex form shown. It is onlynecessary that they be separate disks connected together at their outeredges.

Heretofore spreaders or buttons have frequently been made of heavy castmetal. These are objectionable as absorbing a large amount of heat. Thisheat by radiation and by convection through the Wick-tube is conveyed tothe oil, rendering it more fluid and increasing the flow through thewick, thereby causing the flame to climb To prevent eddies above thesebuttons, holes have been drilled through their periphery, therebypermitting a small quantity ofY air to pass up through the button.` Ihave, however, found in practice that it is better to provide alargenumber of small holes through the button than a much smaller number ofrelatively large holes. It is commercially impracticable, owing to theexpense, to drill large numbers of small holes through a heavy button.Hence I have been driven to the use of lightperforated sheet metal,which can be cheaply produced by means of dies. This is found to give agood result, butis open to the objection that it is easily bent out ofshape by careless handling. My present device obviates this objectionand provides a spreader which absorbs and radiates but little heat,permits a portion of the air to pass upward through it, is sufficientlystrong, and can be economically manufactured. This form of spreader ispreferable to a perforate cylinder as offering much IOO less obstructionto the light-rays. In practice it is found to be hardly visible throughthe flame. The disks g and g', being fora'minous, serve to deflect theflame and a portion of the ascending air, while another portion of theair passes thrbugh the spreader G. Ot' this latter portion a part isfedto the inner mantle of the iame above the spreader, while the restacts to keep the chimney and lamp from overheating by increasing theamount of cool air which passes through the inner air-supply tube.

By the use of the spreader G and dome H, both constructed as shown, atenuous brilliant tulip-shaped flame is produced,while at the same timethe burner and lamp are kept considerably below the usual temperature.

I have shown the tube B as serving the double function ot' innerair-supply tube and inner wick-tube, such being the usual construct-ion.It is evident, however, that the use of separate tubes for thesepurposes would not conflict with any part of my device. It is equallyevident that my device is applica ble to a form of construction in whichair to supply the inner mantle of' the flame is introduced abovethe topof the oil-fount instead of through the bottom of the oil-fount, a'sshown in Fig. I, and that other mechanical 'changes may be made Withoutdeparting from my in- Vention. VIt is obvious, also, that the variousfeatures of my device would he useful if' separately applied*e. g., thateither the spreader G or the dome H might be advantageously used in alamp provided with an i'mperforate dome or with another form ofinnerdeflector, respectively. n

When in the claims I speak of a verticallyconvo'lute partition, it willbe understood that I refer to a partition preferably made from auintegral sheetof thinmetal convoluted or rolled upon itself, as clearlyshown in Fig. 2 of the drawings.

I am aware of certain British patents in which two, three, or moreseparate perforate deftectors or buttons are mounted upon a Vertical rodat some distance apart. Each of these detlectors is open to theobjections already named-z'- e., it must either be so heavy as to absorband radiate a large quantity of heat or be structurally weak. In mydevice two light perforate disks are connected together at their outeredges to form a single deflector or button, thereby combining a maximumof strength with a minimum of thermal capacity. I do not claim as mypresent invention two or more separate perforate deflectors, but asingle deiiector consisting of two perforate disks connected at theirperipheries.

What I claim as my invention, and desire to secure by Letters Patent ofthe United States, is as follows:

l. In an Argand lamp, the combination of an inner air-supply tube a nd avertically-con- Volute partition within said tube, the spiral spacebetween the convolutions of said partition being clear and unobstructed,substantially as described.

2. In an Argand lamp, the combination of an inner air-supply tube and avertically-convolut'e foraminous partition within said tube, the spiralspace ybetween the con-volutions of said partition being clear andunobstructed, substantially as described.

3. An inner air-deflectorof' an Argand lamp, consisting of' twoforaminous disks connected at their outer edges, so that a portion ofthe air which strikes against the lower side of said deiiector may bedeflected outwardly and another portion permitted to pass upward throughsaid defiector, substantially as described.

FRANK RHIND. Vitnesses:

Guo. L. COOPER, H. E. SMITH.

